Faith is central to Christianity. The New Testament repeatedly calls people to believe on the Lord Jesus Christ. There is a definite body of content to be believed, which is part and parcel of our religious activity.

"Luther came to realize that salvation was a gift for the guilty, not a reward for the righteous. Man is not saved by his good works but by trusting the finished work of Christ. Thus, justification by faith alone became the central tenet of the Reformation."